Remove unnecessary class forward declaration in WebViewImpl.h

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 47 matching lines @@
 #include "public/platform/WebRect.h"
 #include "public/platform/WebSize.h"
 #include "public/platform/WebString.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 class DataObject;
 class Frame;
-class GraphicsLayerFactory;
-class HistoryItem;
-class HitTestResult;
-class KeyboardEvent;
-class Page;
-class PagePopup;
-class PagePopupClient;
-class PlatformKeyboardEvent;
-class PopupMenuClient;
 class RenderLayerCompositor;
 }
 
 namespace blink {
-class AutocompletePopupMenuClient;
-class ContextFeaturesClientImpl;
-class ContextMenuClientImpl;
 class GeolocationClientProxy;
 class LinkHighlight;
-class MIDIClientProxy;
 class PopupContainer;
-class PrerendererClientImpl;
-class SpeechInputClientImpl;
-class SpeechRecognitionClientProxy;
 class UserMediaClientImpl;
-class ValidationMessageClientImpl;
-class WebAXObject;
 class WebActiveGestureAnimation;
-class WebDevToolsAgentClient;
 class WebDevToolsAgentPrivate;
 class WebFrameImpl;
-class WebGestureEvent;
 class WebImage;
-class WebKeyboardEvent;
-class WebLayerTreeView;
-class WebMouseEvent;
-class WebMouseWheelEvent;
 class WebPagePopupImpl;
 class WebPlugin;
-class WebPrerendererClient;
 class WebSettingsImpl;
-class WebTouchEvent;
-class WorkerGlobalScopeProxyProviderImpl;
 class FullscreenController;
 
 class WebViewImpl FINAL : public WebView
     , public RefCounted<WebViewImpl>
     , public WebGestureCurveTarget
     , public WebCore::PagePopupDriver
     , public PageWidgetEventHandler {
 public:
     static WebViewImpl* create(WebViewClient*);
 
@@ skipping 633 matching lines @@
     float m_zoomFactorOverride;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif